Commit | Line | Data |
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0d160211 JF |
1 | /* |
2 | * Virtual network driver for conversing with remote driver backends. | |
3 | * | |
4 | * Copyright (c) 2002-2005, K A Fraser | |
5 | * Copyright (c) 2005, XenSource Ltd | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License version 2 | |
9 | * as published by the Free Software Foundation; or, when distributed | |
10 | * separately from the Linux kernel or incorporated into other | |
11 | * software packages, subject to the following license: | |
12 | * | |
13 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
14 | * of this source file (the "Software"), to deal in the Software without | |
15 | * restriction, including without limitation the rights to use, copy, modify, | |
16 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
17 | * and to permit persons to whom the Software is furnished to do so, subject to | |
18 | * the following conditions: | |
19 | * | |
20 | * The above copyright notice and this permission notice shall be included in | |
21 | * all copies or substantial portions of the Software. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
24 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
25 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
26 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
27 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
28 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
29 | * IN THE SOFTWARE. | |
30 | */ | |
31 | ||
383eda32 JP |
32 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
33 | ||
0d160211 JF |
34 | #include <linux/module.h> |
35 | #include <linux/kernel.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/etherdevice.h> | |
38 | #include <linux/skbuff.h> | |
39 | #include <linux/ethtool.h> | |
40 | #include <linux/if_ether.h> | |
9ecd1a75 | 41 | #include <net/tcp.h> |
0d160211 JF |
42 | #include <linux/udp.h> |
43 | #include <linux/moduleparam.h> | |
44 | #include <linux/mm.h> | |
5a0e3ad6 | 45 | #include <linux/slab.h> |
0d160211 JF |
46 | #include <net/ip.h> |
47 | ||
ca981633 | 48 | #include <asm/xen/page.h> |
1ccbf534 | 49 | #include <xen/xen.h> |
0d160211 JF |
50 | #include <xen/xenbus.h> |
51 | #include <xen/events.h> | |
52 | #include <xen/page.h> | |
b9136d20 | 53 | #include <xen/platform_pci.h> |
0d160211 JF |
54 | #include <xen/grant_table.h> |
55 | ||
56 | #include <xen/interface/io/netif.h> | |
57 | #include <xen/interface/memory.h> | |
58 | #include <xen/interface/grant_table.h> | |
59 | ||
0fc0b732 | 60 | static const struct ethtool_ops xennet_ethtool_ops; |
0d160211 JF |
61 | |
62 | struct netfront_cb { | |
3683243b | 63 | int pull_to; |
0d160211 JF |
64 | }; |
65 | ||
66 | #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) | |
67 | ||
68 | #define RX_COPY_THRESHOLD 256 | |
69 | ||
70 | #define GRANT_INVALID_REF 0 | |
71 | ||
667c78af JF |
72 | #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE) |
73 | #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE) | |
40206dd9 | 74 | #define TX_MAX_TARGET min_t(int, NET_TX_RING_SIZE, 256) |
0d160211 | 75 | |
e00f85be | 76 | struct netfront_stats { |
77 | u64 rx_packets; | |
78 | u64 tx_packets; | |
79 | u64 rx_bytes; | |
80 | u64 tx_bytes; | |
81 | struct u64_stats_sync syncp; | |
82 | }; | |
83 | ||
0d160211 JF |
84 | struct netfront_info { |
85 | struct list_head list; | |
86 | struct net_device *netdev; | |
87 | ||
bea3348e | 88 | struct napi_struct napi; |
0d160211 | 89 | |
d634bf2c WL |
90 | /* Split event channels support, tx_* == rx_* when using |
91 | * single event channel. | |
92 | */ | |
93 | unsigned int tx_evtchn, rx_evtchn; | |
94 | unsigned int tx_irq, rx_irq; | |
95 | /* Only used when split event channels support is enabled */ | |
96 | char tx_irq_name[IFNAMSIZ+4]; /* DEVNAME-tx */ | |
97 | char rx_irq_name[IFNAMSIZ+4]; /* DEVNAME-rx */ | |
98 | ||
84284d3c | 99 | struct xenbus_device *xbdev; |
0d160211 | 100 | |
84284d3c JF |
101 | spinlock_t tx_lock; |
102 | struct xen_netif_tx_front_ring tx; | |
103 | int tx_ring_ref; | |
0d160211 JF |
104 | |
105 | /* | |
106 | * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries | |
107 | * are linked from tx_skb_freelist through skb_entry.link. | |
108 | * | |
109 | * NB. Freelist index entries are always going to be less than | |
110 | * PAGE_OFFSET, whereas pointers to skbs will always be equal or | |
111 | * greater than PAGE_OFFSET: we use this property to distinguish | |
112 | * them. | |
113 | */ | |
114 | union skb_entry { | |
115 | struct sk_buff *skb; | |
1ffb40b8 | 116 | unsigned long link; |
0d160211 JF |
117 | } tx_skbs[NET_TX_RING_SIZE]; |
118 | grant_ref_t gref_tx_head; | |
119 | grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; | |
cefe0078 | 120 | struct page *grant_tx_page[NET_TX_RING_SIZE]; |
0d160211 JF |
121 | unsigned tx_skb_freelist; |
122 | ||
84284d3c JF |
123 | spinlock_t rx_lock ____cacheline_aligned_in_smp; |
124 | struct xen_netif_rx_front_ring rx; | |
125 | int rx_ring_ref; | |
126 | ||
127 | /* Receive-ring batched refills. */ | |
128 | #define RX_MIN_TARGET 8 | |
129 | #define RX_DFL_MIN_TARGET 64 | |
130 | #define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256) | |
131 | unsigned rx_min_target, rx_max_target, rx_target; | |
132 | struct sk_buff_head rx_batch; | |
133 | ||
134 | struct timer_list rx_refill_timer; | |
135 | ||
0d160211 JF |
136 | struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; |
137 | grant_ref_t gref_rx_head; | |
138 | grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; | |
139 | ||
0d160211 JF |
140 | unsigned long rx_pfn_array[NET_RX_RING_SIZE]; |
141 | struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1]; | |
142 | struct mmu_update rx_mmu[NET_RX_RING_SIZE]; | |
e0ce4af9 IC |
143 | |
144 | /* Statistics */ | |
e00f85be | 145 | struct netfront_stats __percpu *stats; |
146 | ||
e9a799ea | 147 | unsigned long rx_gso_checksum_fixup; |
0d160211 JF |
148 | }; |
149 | ||
150 | struct netfront_rx_info { | |
151 | struct xen_netif_rx_response rx; | |
152 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; | |
153 | }; | |
154 | ||
1ffb40b8 IY |
155 | static void skb_entry_set_link(union skb_entry *list, unsigned short id) |
156 | { | |
157 | list->link = id; | |
158 | } | |
159 | ||
160 | static int skb_entry_is_link(const union skb_entry *list) | |
161 | { | |
162 | BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); | |
807540ba | 163 | return (unsigned long)list->skb < PAGE_OFFSET; |
1ffb40b8 IY |
164 | } |
165 | ||
0d160211 JF |
166 | /* |
167 | * Access macros for acquiring freeing slots in tx_skbs[]. | |
168 | */ | |
169 | ||
170 | static void add_id_to_freelist(unsigned *head, union skb_entry *list, | |
171 | unsigned short id) | |
172 | { | |
1ffb40b8 | 173 | skb_entry_set_link(&list[id], *head); |
0d160211 JF |
174 | *head = id; |
175 | } | |
176 | ||
177 | static unsigned short get_id_from_freelist(unsigned *head, | |
178 | union skb_entry *list) | |
179 | { | |
180 | unsigned int id = *head; | |
181 | *head = list[id].link; | |
182 | return id; | |
183 | } | |
184 | ||
185 | static int xennet_rxidx(RING_IDX idx) | |
186 | { | |
187 | return idx & (NET_RX_RING_SIZE - 1); | |
188 | } | |
189 | ||
190 | static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np, | |
191 | RING_IDX ri) | |
192 | { | |
193 | int i = xennet_rxidx(ri); | |
194 | struct sk_buff *skb = np->rx_skbs[i]; | |
195 | np->rx_skbs[i] = NULL; | |
196 | return skb; | |
197 | } | |
198 | ||
199 | static grant_ref_t xennet_get_rx_ref(struct netfront_info *np, | |
200 | RING_IDX ri) | |
201 | { | |
202 | int i = xennet_rxidx(ri); | |
203 | grant_ref_t ref = np->grant_rx_ref[i]; | |
204 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
205 | return ref; | |
206 | } | |
207 | ||
208 | #ifdef CONFIG_SYSFS | |
209 | static int xennet_sysfs_addif(struct net_device *netdev); | |
210 | static void xennet_sysfs_delif(struct net_device *netdev); | |
211 | #else /* !CONFIG_SYSFS */ | |
212 | #define xennet_sysfs_addif(dev) (0) | |
213 | #define xennet_sysfs_delif(dev) do { } while (0) | |
214 | #endif | |
215 | ||
3ad9b358 | 216 | static bool xennet_can_sg(struct net_device *dev) |
0d160211 | 217 | { |
3ad9b358 | 218 | return dev->features & NETIF_F_SG; |
0d160211 JF |
219 | } |
220 | ||
221 | ||
222 | static void rx_refill_timeout(unsigned long data) | |
223 | { | |
224 | struct net_device *dev = (struct net_device *)data; | |
bea3348e | 225 | struct netfront_info *np = netdev_priv(dev); |
288379f0 | 226 | napi_schedule(&np->napi); |
0d160211 JF |
227 | } |
228 | ||
229 | static int netfront_tx_slot_available(struct netfront_info *np) | |
230 | { | |
807540ba ED |
231 | return (np->tx.req_prod_pvt - np->tx.rsp_cons) < |
232 | (TX_MAX_TARGET - MAX_SKB_FRAGS - 2); | |
0d160211 JF |
233 | } |
234 | ||
235 | static void xennet_maybe_wake_tx(struct net_device *dev) | |
236 | { | |
237 | struct netfront_info *np = netdev_priv(dev); | |
238 | ||
239 | if (unlikely(netif_queue_stopped(dev)) && | |
240 | netfront_tx_slot_available(np) && | |
241 | likely(netif_running(dev))) | |
242 | netif_wake_queue(dev); | |
243 | } | |
244 | ||
245 | static void xennet_alloc_rx_buffers(struct net_device *dev) | |
246 | { | |
247 | unsigned short id; | |
248 | struct netfront_info *np = netdev_priv(dev); | |
249 | struct sk_buff *skb; | |
250 | struct page *page; | |
251 | int i, batch_target, notify; | |
252 | RING_IDX req_prod = np->rx.req_prod_pvt; | |
0d160211 JF |
253 | grant_ref_t ref; |
254 | unsigned long pfn; | |
255 | void *vaddr; | |
0d160211 JF |
256 | struct xen_netif_rx_request *req; |
257 | ||
258 | if (unlikely(!netif_carrier_ok(dev))) | |
259 | return; | |
260 | ||
261 | /* | |
262 | * Allocate skbuffs greedily, even though we batch updates to the | |
263 | * receive ring. This creates a less bursty demand on the memory | |
264 | * allocator, so should reduce the chance of failed allocation requests | |
265 | * both for ourself and for other kernel subsystems. | |
266 | */ | |
267 | batch_target = np->rx_target - (req_prod - np->rx.rsp_cons); | |
268 | for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) { | |
617a20bb | 269 | skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN, |
0d160211 JF |
270 | GFP_ATOMIC | __GFP_NOWARN); |
271 | if (unlikely(!skb)) | |
272 | goto no_skb; | |
273 | ||
617a20bb IY |
274 | /* Align ip header to a 16 bytes boundary */ |
275 | skb_reserve(skb, NET_IP_ALIGN); | |
276 | ||
0d160211 JF |
277 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); |
278 | if (!page) { | |
279 | kfree_skb(skb); | |
280 | no_skb: | |
0d160211 JF |
281 | /* Could not allocate any skbuffs. Try again later. */ |
282 | mod_timer(&np->rx_refill_timer, | |
283 | jiffies + (HZ/10)); | |
fdcf7765 MJ |
284 | |
285 | /* Any skbuffs queued for refill? Force them out. */ | |
286 | if (i != 0) | |
287 | goto refill; | |
0d160211 JF |
288 | break; |
289 | } | |
290 | ||
093b9c71 | 291 | skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE); |
0d160211 JF |
292 | __skb_queue_tail(&np->rx_batch, skb); |
293 | } | |
294 | ||
295 | /* Is the batch large enough to be worthwhile? */ | |
296 | if (i < (np->rx_target/2)) { | |
297 | if (req_prod > np->rx.sring->req_prod) | |
298 | goto push; | |
299 | return; | |
300 | } | |
301 | ||
302 | /* Adjust our fill target if we risked running out of buffers. */ | |
303 | if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) && | |
304 | ((np->rx_target *= 2) > np->rx_max_target)) | |
305 | np->rx_target = np->rx_max_target; | |
306 | ||
307 | refill: | |
5dcddfae | 308 | for (i = 0; ; i++) { |
0d160211 JF |
309 | skb = __skb_dequeue(&np->rx_batch); |
310 | if (skb == NULL) | |
311 | break; | |
312 | ||
313 | skb->dev = dev; | |
314 | ||
315 | id = xennet_rxidx(req_prod + i); | |
316 | ||
317 | BUG_ON(np->rx_skbs[id]); | |
318 | np->rx_skbs[id] = skb; | |
319 | ||
320 | ref = gnttab_claim_grant_reference(&np->gref_rx_head); | |
321 | BUG_ON((signed short)ref < 0); | |
322 | np->grant_rx_ref[id] = ref; | |
323 | ||
01c68026 IC |
324 | pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0])); |
325 | vaddr = page_address(skb_frag_page(&skb_shinfo(skb)->frags[0])); | |
0d160211 JF |
326 | |
327 | req = RING_GET_REQUEST(&np->rx, req_prod + i); | |
328 | gnttab_grant_foreign_access_ref(ref, | |
329 | np->xbdev->otherend_id, | |
330 | pfn_to_mfn(pfn), | |
331 | 0); | |
332 | ||
333 | req->id = id; | |
334 | req->gref = ref; | |
335 | } | |
336 | ||
5dcddfae | 337 | wmb(); /* barrier so backend seens requests */ |
0d160211 JF |
338 | |
339 | /* Above is a suitable barrier to ensure backend will see requests. */ | |
340 | np->rx.req_prod_pvt = req_prod + i; | |
341 | push: | |
342 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify); | |
343 | if (notify) | |
d634bf2c | 344 | notify_remote_via_irq(np->rx_irq); |
0d160211 JF |
345 | } |
346 | ||
347 | static int xennet_open(struct net_device *dev) | |
348 | { | |
349 | struct netfront_info *np = netdev_priv(dev); | |
350 | ||
bea3348e SH |
351 | napi_enable(&np->napi); |
352 | ||
0d160211 JF |
353 | spin_lock_bh(&np->rx_lock); |
354 | if (netif_carrier_ok(dev)) { | |
355 | xennet_alloc_rx_buffers(dev); | |
356 | np->rx.sring->rsp_event = np->rx.rsp_cons + 1; | |
357 | if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx)) | |
288379f0 | 358 | napi_schedule(&np->napi); |
0d160211 JF |
359 | } |
360 | spin_unlock_bh(&np->rx_lock); | |
361 | ||
0b1ab1b8 | 362 | netif_start_queue(dev); |
0d160211 JF |
363 | |
364 | return 0; | |
365 | } | |
366 | ||
367 | static void xennet_tx_buf_gc(struct net_device *dev) | |
368 | { | |
369 | RING_IDX cons, prod; | |
370 | unsigned short id; | |
371 | struct netfront_info *np = netdev_priv(dev); | |
372 | struct sk_buff *skb; | |
373 | ||
374 | BUG_ON(!netif_carrier_ok(dev)); | |
375 | ||
376 | do { | |
377 | prod = np->tx.sring->rsp_prod; | |
378 | rmb(); /* Ensure we see responses up to 'rp'. */ | |
379 | ||
380 | for (cons = np->tx.rsp_cons; cons != prod; cons++) { | |
381 | struct xen_netif_tx_response *txrsp; | |
382 | ||
383 | txrsp = RING_GET_RESPONSE(&np->tx, cons); | |
f942dc25 | 384 | if (txrsp->status == XEN_NETIF_RSP_NULL) |
0d160211 JF |
385 | continue; |
386 | ||
387 | id = txrsp->id; | |
388 | skb = np->tx_skbs[id].skb; | |
389 | if (unlikely(gnttab_query_foreign_access( | |
390 | np->grant_tx_ref[id]) != 0)) { | |
383eda32 JP |
391 | pr_alert("%s: warning -- grant still in use by backend domain\n", |
392 | __func__); | |
0d160211 JF |
393 | BUG(); |
394 | } | |
395 | gnttab_end_foreign_access_ref( | |
396 | np->grant_tx_ref[id], GNTMAP_readonly); | |
397 | gnttab_release_grant_reference( | |
398 | &np->gref_tx_head, np->grant_tx_ref[id]); | |
399 | np->grant_tx_ref[id] = GRANT_INVALID_REF; | |
cefe0078 | 400 | np->grant_tx_page[id] = NULL; |
0d160211 JF |
401 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id); |
402 | dev_kfree_skb_irq(skb); | |
403 | } | |
404 | ||
405 | np->tx.rsp_cons = prod; | |
406 | ||
407 | /* | |
408 | * Set a new event, then check for race with update of tx_cons. | |
409 | * Note that it is essential to schedule a callback, no matter | |
410 | * how few buffers are pending. Even if there is space in the | |
411 | * transmit ring, higher layers may be blocked because too much | |
412 | * data is outstanding: in such cases notification from Xen is | |
413 | * likely to be the only kick that we'll get. | |
414 | */ | |
415 | np->tx.sring->rsp_event = | |
416 | prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; | |
417 | mb(); /* update shared area */ | |
418 | } while ((cons == prod) && (prod != np->tx.sring->rsp_prod)); | |
419 | ||
420 | xennet_maybe_wake_tx(dev); | |
421 | } | |
422 | ||
423 | static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev, | |
424 | struct xen_netif_tx_request *tx) | |
425 | { | |
426 | struct netfront_info *np = netdev_priv(dev); | |
427 | char *data = skb->data; | |
428 | unsigned long mfn; | |
429 | RING_IDX prod = np->tx.req_prod_pvt; | |
430 | int frags = skb_shinfo(skb)->nr_frags; | |
431 | unsigned int offset = offset_in_page(data); | |
432 | unsigned int len = skb_headlen(skb); | |
433 | unsigned int id; | |
434 | grant_ref_t ref; | |
435 | int i; | |
436 | ||
437 | /* While the header overlaps a page boundary (including being | |
438 | larger than a page), split it it into page-sized chunks. */ | |
439 | while (len > PAGE_SIZE - offset) { | |
440 | tx->size = PAGE_SIZE - offset; | |
f942dc25 | 441 | tx->flags |= XEN_NETTXF_more_data; |
0d160211 JF |
442 | len -= tx->size; |
443 | data += tx->size; | |
444 | offset = 0; | |
445 | ||
446 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
447 | np->tx_skbs[id].skb = skb_get(skb); | |
448 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
449 | tx->id = id; | |
450 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
451 | BUG_ON((signed short)ref < 0); | |
452 | ||
453 | mfn = virt_to_mfn(data); | |
454 | gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id, | |
455 | mfn, GNTMAP_readonly); | |
456 | ||
cefe0078 | 457 | np->grant_tx_page[id] = virt_to_page(data); |
0d160211 JF |
458 | tx->gref = np->grant_tx_ref[id] = ref; |
459 | tx->offset = offset; | |
460 | tx->size = len; | |
461 | tx->flags = 0; | |
462 | } | |
463 | ||
464 | /* Grant backend access to each skb fragment page. */ | |
465 | for (i = 0; i < frags; i++) { | |
466 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
f36c3747 | 467 | struct page *page = skb_frag_page(frag); |
0d160211 | 468 | |
f36c3747 IC |
469 | len = skb_frag_size(frag); |
470 | offset = frag->page_offset; | |
0d160211 | 471 | |
f36c3747 IC |
472 | /* Data must not cross a page boundary. */ |
473 | BUG_ON(len + offset > PAGE_SIZE<<compound_order(page)); | |
0d160211 | 474 | |
f36c3747 IC |
475 | /* Skip unused frames from start of page */ |
476 | page += offset >> PAGE_SHIFT; | |
477 | offset &= ~PAGE_MASK; | |
0d160211 | 478 | |
f36c3747 IC |
479 | while (len > 0) { |
480 | unsigned long bytes; | |
481 | ||
482 | BUG_ON(offset >= PAGE_SIZE); | |
483 | ||
484 | bytes = PAGE_SIZE - offset; | |
485 | if (bytes > len) | |
486 | bytes = len; | |
487 | ||
488 | tx->flags |= XEN_NETTXF_more_data; | |
489 | ||
490 | id = get_id_from_freelist(&np->tx_skb_freelist, | |
491 | np->tx_skbs); | |
492 | np->tx_skbs[id].skb = skb_get(skb); | |
493 | tx = RING_GET_REQUEST(&np->tx, prod++); | |
494 | tx->id = id; | |
495 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
496 | BUG_ON((signed short)ref < 0); | |
497 | ||
498 | mfn = pfn_to_mfn(page_to_pfn(page)); | |
499 | gnttab_grant_foreign_access_ref(ref, | |
500 | np->xbdev->otherend_id, | |
501 | mfn, GNTMAP_readonly); | |
502 | ||
cefe0078 | 503 | np->grant_tx_page[id] = page; |
f36c3747 IC |
504 | tx->gref = np->grant_tx_ref[id] = ref; |
505 | tx->offset = offset; | |
506 | tx->size = bytes; | |
507 | tx->flags = 0; | |
508 | ||
509 | offset += bytes; | |
510 | len -= bytes; | |
511 | ||
512 | /* Next frame */ | |
513 | if (offset == PAGE_SIZE && len) { | |
514 | BUG_ON(!PageCompound(page)); | |
515 | page++; | |
516 | offset = 0; | |
517 | } | |
518 | } | |
0d160211 JF |
519 | } |
520 | ||
521 | np->tx.req_prod_pvt = prod; | |
522 | } | |
523 | ||
f36c3747 IC |
524 | /* |
525 | * Count how many ring slots are required to send the frags of this | |
526 | * skb. Each frag might be a compound page. | |
527 | */ | |
528 | static int xennet_count_skb_frag_slots(struct sk_buff *skb) | |
529 | { | |
530 | int i, frags = skb_shinfo(skb)->nr_frags; | |
531 | int pages = 0; | |
532 | ||
533 | for (i = 0; i < frags; i++) { | |
534 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
535 | unsigned long size = skb_frag_size(frag); | |
536 | unsigned long offset = frag->page_offset; | |
537 | ||
538 | /* Skip unused frames from start of page */ | |
539 | offset &= ~PAGE_MASK; | |
540 | ||
541 | pages += PFN_UP(offset + size); | |
542 | } | |
543 | ||
544 | return pages; | |
545 | } | |
546 | ||
0d160211 JF |
547 | static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
548 | { | |
549 | unsigned short id; | |
550 | struct netfront_info *np = netdev_priv(dev); | |
e00f85be | 551 | struct netfront_stats *stats = this_cpu_ptr(np->stats); |
0d160211 | 552 | struct xen_netif_tx_request *tx; |
0d160211 JF |
553 | char *data = skb->data; |
554 | RING_IDX i; | |
555 | grant_ref_t ref; | |
556 | unsigned long mfn; | |
557 | int notify; | |
f36c3747 | 558 | int slots; |
0d160211 JF |
559 | unsigned int offset = offset_in_page(data); |
560 | unsigned int len = skb_headlen(skb); | |
cf66f9d4 | 561 | unsigned long flags; |
0d160211 | 562 | |
9ecd1a75 WL |
563 | /* If skb->len is too big for wire format, drop skb and alert |
564 | * user about misconfiguration. | |
565 | */ | |
566 | if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { | |
567 | net_alert_ratelimited( | |
568 | "xennet: skb->len = %u, too big for wire format\n", | |
569 | skb->len); | |
570 | goto drop; | |
571 | } | |
572 | ||
f36c3747 IC |
573 | slots = DIV_ROUND_UP(offset + len, PAGE_SIZE) + |
574 | xennet_count_skb_frag_slots(skb); | |
575 | if (unlikely(slots > MAX_SKB_FRAGS + 1)) { | |
576 | net_alert_ratelimited( | |
577 | "xennet: skb rides the rocket: %d slots\n", slots); | |
0d160211 JF |
578 | goto drop; |
579 | } | |
580 | ||
cf66f9d4 | 581 | spin_lock_irqsave(&np->tx_lock, flags); |
0d160211 JF |
582 | |
583 | if (unlikely(!netif_carrier_ok(dev) || | |
f36c3747 | 584 | (slots > 1 && !xennet_can_sg(dev)) || |
fc741216 | 585 | netif_needs_gso(skb, netif_skb_features(skb)))) { |
cf66f9d4 | 586 | spin_unlock_irqrestore(&np->tx_lock, flags); |
0d160211 JF |
587 | goto drop; |
588 | } | |
589 | ||
590 | i = np->tx.req_prod_pvt; | |
591 | ||
592 | id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs); | |
593 | np->tx_skbs[id].skb = skb; | |
594 | ||
595 | tx = RING_GET_REQUEST(&np->tx, i); | |
596 | ||
597 | tx->id = id; | |
598 | ref = gnttab_claim_grant_reference(&np->gref_tx_head); | |
599 | BUG_ON((signed short)ref < 0); | |
600 | mfn = virt_to_mfn(data); | |
601 | gnttab_grant_foreign_access_ref( | |
602 | ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly); | |
cefe0078 | 603 | np->grant_tx_page[id] = virt_to_page(data); |
0d160211 JF |
604 | tx->gref = np->grant_tx_ref[id] = ref; |
605 | tx->offset = offset; | |
606 | tx->size = len; | |
0d160211 JF |
607 | |
608 | tx->flags = 0; | |
609 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
610 | /* local packet? */ | |
f942dc25 | 611 | tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; |
0d160211 JF |
612 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
613 | /* remote but checksummed. */ | |
f942dc25 | 614 | tx->flags |= XEN_NETTXF_data_validated; |
0d160211 JF |
615 | |
616 | if (skb_shinfo(skb)->gso_size) { | |
617 | struct xen_netif_extra_info *gso; | |
618 | ||
619 | gso = (struct xen_netif_extra_info *) | |
620 | RING_GET_REQUEST(&np->tx, ++i); | |
621 | ||
e2d617c0 | 622 | tx->flags |= XEN_NETTXF_extra_info; |
0d160211 JF |
623 | |
624 | gso->u.gso.size = skb_shinfo(skb)->gso_size; | |
2c0057de PD |
625 | gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ? |
626 | XEN_NETIF_GSO_TYPE_TCPV6 : | |
627 | XEN_NETIF_GSO_TYPE_TCPV4; | |
0d160211 JF |
628 | gso->u.gso.pad = 0; |
629 | gso->u.gso.features = 0; | |
630 | ||
631 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; | |
632 | gso->flags = 0; | |
0d160211 JF |
633 | } |
634 | ||
635 | np->tx.req_prod_pvt = i + 1; | |
636 | ||
637 | xennet_make_frags(skb, dev, tx); | |
638 | tx->size = skb->len; | |
639 | ||
640 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify); | |
641 | if (notify) | |
d634bf2c | 642 | notify_remote_via_irq(np->tx_irq); |
0d160211 | 643 | |
e00f85be | 644 | u64_stats_update_begin(&stats->syncp); |
645 | stats->tx_bytes += skb->len; | |
646 | stats->tx_packets++; | |
647 | u64_stats_update_end(&stats->syncp); | |
10a273a6 JF |
648 | |
649 | /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ | |
0d160211 JF |
650 | xennet_tx_buf_gc(dev); |
651 | ||
652 | if (!netfront_tx_slot_available(np)) | |
653 | netif_stop_queue(dev); | |
654 | ||
cf66f9d4 | 655 | spin_unlock_irqrestore(&np->tx_lock, flags); |
0d160211 | 656 | |
6ed10654 | 657 | return NETDEV_TX_OK; |
0d160211 JF |
658 | |
659 | drop: | |
09f75cd7 | 660 | dev->stats.tx_dropped++; |
979de8a0 | 661 | dev_kfree_skb_any(skb); |
6ed10654 | 662 | return NETDEV_TX_OK; |
0d160211 JF |
663 | } |
664 | ||
665 | static int xennet_close(struct net_device *dev) | |
666 | { | |
667 | struct netfront_info *np = netdev_priv(dev); | |
668 | netif_stop_queue(np->netdev); | |
bea3348e | 669 | napi_disable(&np->napi); |
0d160211 JF |
670 | return 0; |
671 | } | |
672 | ||
0d160211 JF |
673 | static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb, |
674 | grant_ref_t ref) | |
675 | { | |
676 | int new = xennet_rxidx(np->rx.req_prod_pvt); | |
677 | ||
678 | BUG_ON(np->rx_skbs[new]); | |
679 | np->rx_skbs[new] = skb; | |
680 | np->grant_rx_ref[new] = ref; | |
681 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; | |
682 | RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; | |
683 | np->rx.req_prod_pvt++; | |
684 | } | |
685 | ||
686 | static int xennet_get_extras(struct netfront_info *np, | |
687 | struct xen_netif_extra_info *extras, | |
688 | RING_IDX rp) | |
689 | ||
690 | { | |
691 | struct xen_netif_extra_info *extra; | |
692 | struct device *dev = &np->netdev->dev; | |
693 | RING_IDX cons = np->rx.rsp_cons; | |
694 | int err = 0; | |
695 | ||
696 | do { | |
697 | struct sk_buff *skb; | |
698 | grant_ref_t ref; | |
699 | ||
700 | if (unlikely(cons + 1 == rp)) { | |
701 | if (net_ratelimit()) | |
702 | dev_warn(dev, "Missing extra info\n"); | |
703 | err = -EBADR; | |
704 | break; | |
705 | } | |
706 | ||
707 | extra = (struct xen_netif_extra_info *) | |
708 | RING_GET_RESPONSE(&np->rx, ++cons); | |
709 | ||
710 | if (unlikely(!extra->type || | |
711 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
712 | if (net_ratelimit()) | |
713 | dev_warn(dev, "Invalid extra type: %d\n", | |
714 | extra->type); | |
715 | err = -EINVAL; | |
716 | } else { | |
717 | memcpy(&extras[extra->type - 1], extra, | |
718 | sizeof(*extra)); | |
719 | } | |
720 | ||
721 | skb = xennet_get_rx_skb(np, cons); | |
722 | ref = xennet_get_rx_ref(np, cons); | |
723 | xennet_move_rx_slot(np, skb, ref); | |
724 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); | |
725 | ||
726 | np->rx.rsp_cons = cons; | |
727 | return err; | |
728 | } | |
729 | ||
730 | static int xennet_get_responses(struct netfront_info *np, | |
731 | struct netfront_rx_info *rinfo, RING_IDX rp, | |
732 | struct sk_buff_head *list) | |
733 | { | |
734 | struct xen_netif_rx_response *rx = &rinfo->rx; | |
735 | struct xen_netif_extra_info *extras = rinfo->extras; | |
736 | struct device *dev = &np->netdev->dev; | |
737 | RING_IDX cons = np->rx.rsp_cons; | |
738 | struct sk_buff *skb = xennet_get_rx_skb(np, cons); | |
739 | grant_ref_t ref = xennet_get_rx_ref(np, cons); | |
740 | int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); | |
7158ff6d | 741 | int slots = 1; |
0d160211 JF |
742 | int err = 0; |
743 | unsigned long ret; | |
744 | ||
f942dc25 | 745 | if (rx->flags & XEN_NETRXF_extra_info) { |
0d160211 JF |
746 | err = xennet_get_extras(np, extras, rp); |
747 | cons = np->rx.rsp_cons; | |
748 | } | |
749 | ||
750 | for (;;) { | |
751 | if (unlikely(rx->status < 0 || | |
752 | rx->offset + rx->status > PAGE_SIZE)) { | |
753 | if (net_ratelimit()) | |
754 | dev_warn(dev, "rx->offset: %x, size: %u\n", | |
755 | rx->offset, rx->status); | |
756 | xennet_move_rx_slot(np, skb, ref); | |
757 | err = -EINVAL; | |
758 | goto next; | |
759 | } | |
760 | ||
761 | /* | |
762 | * This definitely indicates a bug, either in this driver or in | |
763 | * the backend driver. In future this should flag the bad | |
697089dc | 764 | * situation to the system controller to reboot the backend. |
0d160211 JF |
765 | */ |
766 | if (ref == GRANT_INVALID_REF) { | |
767 | if (net_ratelimit()) | |
768 | dev_warn(dev, "Bad rx response id %d.\n", | |
769 | rx->id); | |
770 | err = -EINVAL; | |
771 | goto next; | |
772 | } | |
773 | ||
774 | ret = gnttab_end_foreign_access_ref(ref, 0); | |
775 | BUG_ON(!ret); | |
776 | ||
777 | gnttab_release_grant_reference(&np->gref_rx_head, ref); | |
778 | ||
779 | __skb_queue_tail(list, skb); | |
780 | ||
781 | next: | |
f942dc25 | 782 | if (!(rx->flags & XEN_NETRXF_more_data)) |
0d160211 JF |
783 | break; |
784 | ||
7158ff6d | 785 | if (cons + slots == rp) { |
0d160211 | 786 | if (net_ratelimit()) |
7158ff6d | 787 | dev_warn(dev, "Need more slots\n"); |
0d160211 JF |
788 | err = -ENOENT; |
789 | break; | |
790 | } | |
791 | ||
7158ff6d WL |
792 | rx = RING_GET_RESPONSE(&np->rx, cons + slots); |
793 | skb = xennet_get_rx_skb(np, cons + slots); | |
794 | ref = xennet_get_rx_ref(np, cons + slots); | |
795 | slots++; | |
0d160211 JF |
796 | } |
797 | ||
7158ff6d | 798 | if (unlikely(slots > max)) { |
0d160211 | 799 | if (net_ratelimit()) |
697089dc | 800 | dev_warn(dev, "Too many slots\n"); |
0d160211 JF |
801 | err = -E2BIG; |
802 | } | |
803 | ||
804 | if (unlikely(err)) | |
7158ff6d | 805 | np->rx.rsp_cons = cons + slots; |
0d160211 JF |
806 | |
807 | return err; | |
808 | } | |
809 | ||
810 | static int xennet_set_skb_gso(struct sk_buff *skb, | |
811 | struct xen_netif_extra_info *gso) | |
812 | { | |
813 | if (!gso->u.gso.size) { | |
814 | if (net_ratelimit()) | |
383eda32 | 815 | pr_warn("GSO size must not be zero\n"); |
0d160211 JF |
816 | return -EINVAL; |
817 | } | |
818 | ||
2c0057de PD |
819 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 && |
820 | gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) { | |
0d160211 | 821 | if (net_ratelimit()) |
383eda32 | 822 | pr_warn("Bad GSO type %d\n", gso->u.gso.type); |
0d160211 JF |
823 | return -EINVAL; |
824 | } | |
825 | ||
826 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
2c0057de PD |
827 | skb_shinfo(skb)->gso_type = |
828 | (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ? | |
829 | SKB_GSO_TCPV4 : | |
830 | SKB_GSO_TCPV6; | |
0d160211 JF |
831 | |
832 | /* Header must be checked, and gso_segs computed. */ | |
833 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
834 | skb_shinfo(skb)->gso_segs = 0; | |
835 | ||
836 | return 0; | |
837 | } | |
838 | ||
839 | static RING_IDX xennet_fill_frags(struct netfront_info *np, | |
840 | struct sk_buff *skb, | |
841 | struct sk_buff_head *list) | |
842 | { | |
843 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
0d160211 | 844 | RING_IDX cons = np->rx.rsp_cons; |
0d160211 JF |
845 | struct sk_buff *nskb; |
846 | ||
847 | while ((nskb = __skb_dequeue(list))) { | |
848 | struct xen_netif_rx_response *rx = | |
849 | RING_GET_RESPONSE(&np->rx, ++cons); | |
01c68026 | 850 | skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; |
0d160211 | 851 | |
093b9c71 JB |
852 | if (shinfo->nr_frags == MAX_SKB_FRAGS) { |
853 | unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; | |
0d160211 | 854 | |
093b9c71 JB |
855 | BUG_ON(pull_to <= skb_headlen(skb)); |
856 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); | |
857 | } | |
858 | BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS); | |
859 | ||
860 | skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag), | |
861 | rx->offset, rx->status, PAGE_SIZE); | |
0d160211 JF |
862 | |
863 | skb_shinfo(nskb)->nr_frags = 0; | |
864 | kfree_skb(nskb); | |
0d160211 JF |
865 | } |
866 | ||
0d160211 JF |
867 | return cons; |
868 | } | |
869 | ||
e0ce4af9 | 870 | static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
0d160211 | 871 | { |
b5cf66cd | 872 | bool recalculate_partial_csum = false; |
e0ce4af9 IC |
873 | |
874 | /* | |
875 | * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy | |
876 | * peers can fail to set NETRXF_csum_blank when sending a GSO | |
877 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and | |
878 | * recalculate the partial checksum. | |
879 | */ | |
880 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { | |
881 | struct netfront_info *np = netdev_priv(dev); | |
882 | np->rx_gso_checksum_fixup++; | |
883 | skb->ip_summed = CHECKSUM_PARTIAL; | |
b5cf66cd | 884 | recalculate_partial_csum = true; |
e0ce4af9 IC |
885 | } |
886 | ||
887 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ | |
888 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
889 | return 0; | |
0d160211 | 890 | |
b5cf66cd | 891 | return skb_checksum_setup(skb, recalculate_partial_csum); |
0d160211 JF |
892 | } |
893 | ||
894 | static int handle_incoming_queue(struct net_device *dev, | |
09f75cd7 | 895 | struct sk_buff_head *rxq) |
0d160211 | 896 | { |
e00f85be | 897 | struct netfront_info *np = netdev_priv(dev); |
898 | struct netfront_stats *stats = this_cpu_ptr(np->stats); | |
0d160211 JF |
899 | int packets_dropped = 0; |
900 | struct sk_buff *skb; | |
901 | ||
902 | while ((skb = __skb_dequeue(rxq)) != NULL) { | |
3683243b | 903 | int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
0d160211 | 904 | |
093b9c71 JB |
905 | if (pull_to > skb_headlen(skb)) |
906 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); | |
0d160211 JF |
907 | |
908 | /* Ethernet work: Delayed to here as it peeks the header. */ | |
909 | skb->protocol = eth_type_trans(skb, dev); | |
d554f73d | 910 | skb_reset_network_header(skb); |
0d160211 | 911 | |
e0ce4af9 IC |
912 | if (checksum_setup(dev, skb)) { |
913 | kfree_skb(skb); | |
914 | packets_dropped++; | |
915 | dev->stats.rx_errors++; | |
916 | continue; | |
0d160211 JF |
917 | } |
918 | ||
e00f85be | 919 | u64_stats_update_begin(&stats->syncp); |
920 | stats->rx_packets++; | |
921 | stats->rx_bytes += skb->len; | |
922 | u64_stats_update_end(&stats->syncp); | |
0d160211 JF |
923 | |
924 | /* Pass it up. */ | |
99d3d587 | 925 | napi_gro_receive(&np->napi, skb); |
0d160211 JF |
926 | } |
927 | ||
928 | return packets_dropped; | |
929 | } | |
930 | ||
bea3348e | 931 | static int xennet_poll(struct napi_struct *napi, int budget) |
0d160211 | 932 | { |
bea3348e SH |
933 | struct netfront_info *np = container_of(napi, struct netfront_info, napi); |
934 | struct net_device *dev = np->netdev; | |
0d160211 JF |
935 | struct sk_buff *skb; |
936 | struct netfront_rx_info rinfo; | |
937 | struct xen_netif_rx_response *rx = &rinfo.rx; | |
938 | struct xen_netif_extra_info *extras = rinfo.extras; | |
939 | RING_IDX i, rp; | |
bea3348e | 940 | int work_done; |
0d160211 JF |
941 | struct sk_buff_head rxq; |
942 | struct sk_buff_head errq; | |
943 | struct sk_buff_head tmpq; | |
944 | unsigned long flags; | |
0d160211 JF |
945 | int err; |
946 | ||
947 | spin_lock(&np->rx_lock); | |
948 | ||
0d160211 JF |
949 | skb_queue_head_init(&rxq); |
950 | skb_queue_head_init(&errq); | |
951 | skb_queue_head_init(&tmpq); | |
952 | ||
0d160211 JF |
953 | rp = np->rx.sring->rsp_prod; |
954 | rmb(); /* Ensure we see queued responses up to 'rp'. */ | |
955 | ||
956 | i = np->rx.rsp_cons; | |
957 | work_done = 0; | |
958 | while ((i != rp) && (work_done < budget)) { | |
959 | memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); | |
960 | memset(extras, 0, sizeof(rinfo.extras)); | |
961 | ||
962 | err = xennet_get_responses(np, &rinfo, rp, &tmpq); | |
963 | ||
964 | if (unlikely(err)) { | |
965 | err: | |
966 | while ((skb = __skb_dequeue(&tmpq))) | |
967 | __skb_queue_tail(&errq, skb); | |
09f75cd7 | 968 | dev->stats.rx_errors++; |
0d160211 JF |
969 | i = np->rx.rsp_cons; |
970 | continue; | |
971 | } | |
972 | ||
973 | skb = __skb_dequeue(&tmpq); | |
974 | ||
975 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { | |
976 | struct xen_netif_extra_info *gso; | |
977 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
978 | ||
979 | if (unlikely(xennet_set_skb_gso(skb, gso))) { | |
980 | __skb_queue_head(&tmpq, skb); | |
981 | np->rx.rsp_cons += skb_queue_len(&tmpq); | |
982 | goto err; | |
983 | } | |
984 | } | |
985 | ||
3683243b IC |
986 | NETFRONT_SKB_CB(skb)->pull_to = rx->status; |
987 | if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) | |
988 | NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; | |
0d160211 | 989 | |
3683243b IC |
990 | skb_shinfo(skb)->frags[0].page_offset = rx->offset; |
991 | skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); | |
992 | skb->data_len = rx->status; | |
093b9c71 | 993 | skb->len += rx->status; |
0d160211 JF |
994 | |
995 | i = xennet_fill_frags(np, skb, &tmpq); | |
996 | ||
f942dc25 | 997 | if (rx->flags & XEN_NETRXF_csum_blank) |
0d160211 | 998 | skb->ip_summed = CHECKSUM_PARTIAL; |
f942dc25 | 999 | else if (rx->flags & XEN_NETRXF_data_validated) |
0d160211 JF |
1000 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1001 | ||
1002 | __skb_queue_tail(&rxq, skb); | |
1003 | ||
1004 | np->rx.rsp_cons = ++i; | |
1005 | work_done++; | |
1006 | } | |
1007 | ||
56cfe5d0 | 1008 | __skb_queue_purge(&errq); |
0d160211 JF |
1009 | |
1010 | work_done -= handle_incoming_queue(dev, &rxq); | |
1011 | ||
1012 | /* If we get a callback with very few responses, reduce fill target. */ | |
1013 | /* NB. Note exponential increase, linear decrease. */ | |
1014 | if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) > | |
1015 | ((3*np->rx_target) / 4)) && | |
1016 | (--np->rx_target < np->rx_min_target)) | |
1017 | np->rx_target = np->rx_min_target; | |
1018 | ||
1019 | xennet_alloc_rx_buffers(dev); | |
1020 | ||
0d160211 | 1021 | if (work_done < budget) { |
bea3348e SH |
1022 | int more_to_do = 0; |
1023 | ||
99d3d587 WL |
1024 | napi_gro_flush(napi, false); |
1025 | ||
0d160211 JF |
1026 | local_irq_save(flags); |
1027 | ||
1028 | RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do); | |
1029 | if (!more_to_do) | |
288379f0 | 1030 | __napi_complete(napi); |
0d160211 JF |
1031 | |
1032 | local_irq_restore(flags); | |
1033 | } | |
1034 | ||
1035 | spin_unlock(&np->rx_lock); | |
1036 | ||
bea3348e | 1037 | return work_done; |
0d160211 JF |
1038 | } |
1039 | ||
1040 | static int xennet_change_mtu(struct net_device *dev, int mtu) | |
1041 | { | |
9ecd1a75 WL |
1042 | int max = xennet_can_sg(dev) ? |
1043 | XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER : ETH_DATA_LEN; | |
0d160211 JF |
1044 | |
1045 | if (mtu > max) | |
1046 | return -EINVAL; | |
1047 | dev->mtu = mtu; | |
1048 | return 0; | |
1049 | } | |
1050 | ||
e00f85be | 1051 | static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev, |
1052 | struct rtnl_link_stats64 *tot) | |
1053 | { | |
1054 | struct netfront_info *np = netdev_priv(dev); | |
1055 | int cpu; | |
1056 | ||
1057 | for_each_possible_cpu(cpu) { | |
1058 | struct netfront_stats *stats = per_cpu_ptr(np->stats, cpu); | |
1059 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; | |
1060 | unsigned int start; | |
1061 | ||
1062 | do { | |
57a7744e | 1063 | start = u64_stats_fetch_begin_irq(&stats->syncp); |
e00f85be | 1064 | |
1065 | rx_packets = stats->rx_packets; | |
1066 | tx_packets = stats->tx_packets; | |
1067 | rx_bytes = stats->rx_bytes; | |
1068 | tx_bytes = stats->tx_bytes; | |
57a7744e | 1069 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
e00f85be | 1070 | |
1071 | tot->rx_packets += rx_packets; | |
1072 | tot->tx_packets += tx_packets; | |
1073 | tot->rx_bytes += rx_bytes; | |
1074 | tot->tx_bytes += tx_bytes; | |
1075 | } | |
1076 | ||
1077 | tot->rx_errors = dev->stats.rx_errors; | |
1078 | tot->tx_dropped = dev->stats.tx_dropped; | |
1079 | ||
1080 | return tot; | |
1081 | } | |
1082 | ||
0d160211 JF |
1083 | static void xennet_release_tx_bufs(struct netfront_info *np) |
1084 | { | |
1085 | struct sk_buff *skb; | |
1086 | int i; | |
1087 | ||
1088 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1089 | /* Skip over entries which are actually freelist references */ | |
1ffb40b8 | 1090 | if (skb_entry_is_link(&np->tx_skbs[i])) |
0d160211 JF |
1091 | continue; |
1092 | ||
1093 | skb = np->tx_skbs[i].skb; | |
cefe0078 AL |
1094 | get_page(np->grant_tx_page[i]); |
1095 | gnttab_end_foreign_access(np->grant_tx_ref[i], | |
1096 | GNTMAP_readonly, | |
1097 | (unsigned long)page_address(np->grant_tx_page[i])); | |
1098 | np->grant_tx_page[i] = NULL; | |
0d160211 JF |
1099 | np->grant_tx_ref[i] = GRANT_INVALID_REF; |
1100 | add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i); | |
1101 | dev_kfree_skb_irq(skb); | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | static void xennet_release_rx_bufs(struct netfront_info *np) | |
1106 | { | |
0d160211 JF |
1107 | int id, ref; |
1108 | ||
0d160211 JF |
1109 | spin_lock_bh(&np->rx_lock); |
1110 | ||
1111 | for (id = 0; id < NET_RX_RING_SIZE; id++) { | |
cefe0078 AL |
1112 | struct sk_buff *skb; |
1113 | struct page *page; | |
0d160211 JF |
1114 | |
1115 | skb = np->rx_skbs[id]; | |
cefe0078 | 1116 | if (!skb) |
0d160211 | 1117 | continue; |
0d160211 | 1118 | |
cefe0078 AL |
1119 | ref = np->grant_rx_ref[id]; |
1120 | if (ref == GRANT_INVALID_REF) | |
1121 | continue; | |
0d160211 | 1122 | |
cefe0078 | 1123 | page = skb_frag_page(&skb_shinfo(skb)->frags[0]); |
0d160211 | 1124 | |
cefe0078 AL |
1125 | /* gnttab_end_foreign_access() needs a page ref until |
1126 | * foreign access is ended (which may be deferred). | |
1127 | */ | |
1128 | get_page(page); | |
1129 | gnttab_end_foreign_access(ref, 0, | |
1130 | (unsigned long)page_address(page)); | |
1131 | np->grant_rx_ref[id] = GRANT_INVALID_REF; | |
0d160211 | 1132 | |
cefe0078 | 1133 | kfree_skb(skb); |
0d160211 JF |
1134 | } |
1135 | ||
0d160211 JF |
1136 | spin_unlock_bh(&np->rx_lock); |
1137 | } | |
1138 | ||
1139 | static void xennet_uninit(struct net_device *dev) | |
1140 | { | |
1141 | struct netfront_info *np = netdev_priv(dev); | |
1142 | xennet_release_tx_bufs(np); | |
1143 | xennet_release_rx_bufs(np); | |
1144 | gnttab_free_grant_references(np->gref_tx_head); | |
1145 | gnttab_free_grant_references(np->gref_rx_head); | |
1146 | } | |
1147 | ||
c8f44aff MM |
1148 | static netdev_features_t xennet_fix_features(struct net_device *dev, |
1149 | netdev_features_t features) | |
8f7b01a1 ED |
1150 | { |
1151 | struct netfront_info *np = netdev_priv(dev); | |
1152 | int val; | |
1153 | ||
1154 | if (features & NETIF_F_SG) { | |
1155 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg", | |
1156 | "%d", &val) < 0) | |
1157 | val = 0; | |
1158 | ||
1159 | if (!val) | |
1160 | features &= ~NETIF_F_SG; | |
1161 | } | |
1162 | ||
2c0057de PD |
1163 | if (features & NETIF_F_IPV6_CSUM) { |
1164 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1165 | "feature-ipv6-csum-offload", "%d", &val) < 0) | |
1166 | val = 0; | |
1167 | ||
1168 | if (!val) | |
1169 | features &= ~NETIF_F_IPV6_CSUM; | |
1170 | } | |
1171 | ||
8f7b01a1 ED |
1172 | if (features & NETIF_F_TSO) { |
1173 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1174 | "feature-gso-tcpv4", "%d", &val) < 0) | |
1175 | val = 0; | |
1176 | ||
1177 | if (!val) | |
1178 | features &= ~NETIF_F_TSO; | |
1179 | } | |
1180 | ||
2c0057de PD |
1181 | if (features & NETIF_F_TSO6) { |
1182 | if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1183 | "feature-gso-tcpv6", "%d", &val) < 0) | |
1184 | val = 0; | |
1185 | ||
1186 | if (!val) | |
1187 | features &= ~NETIF_F_TSO6; | |
1188 | } | |
1189 | ||
8f7b01a1 ED |
1190 | return features; |
1191 | } | |
1192 | ||
c8f44aff MM |
1193 | static int xennet_set_features(struct net_device *dev, |
1194 | netdev_features_t features) | |
8f7b01a1 ED |
1195 | { |
1196 | if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { | |
1197 | netdev_info(dev, "Reducing MTU because no SG offload"); | |
1198 | dev->mtu = ETH_DATA_LEN; | |
1199 | } | |
1200 | ||
1201 | return 0; | |
1202 | } | |
1203 | ||
d634bf2c | 1204 | static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) |
cf66f9d4 | 1205 | { |
d634bf2c WL |
1206 | struct netfront_info *np = dev_id; |
1207 | struct net_device *dev = np->netdev; | |
cf66f9d4 KRW |
1208 | unsigned long flags; |
1209 | ||
1210 | spin_lock_irqsave(&np->tx_lock, flags); | |
d634bf2c WL |
1211 | xennet_tx_buf_gc(dev); |
1212 | spin_unlock_irqrestore(&np->tx_lock, flags); | |
cf66f9d4 | 1213 | |
d634bf2c WL |
1214 | return IRQ_HANDLED; |
1215 | } | |
1216 | ||
1217 | static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) | |
1218 | { | |
1219 | struct netfront_info *np = dev_id; | |
1220 | struct net_device *dev = np->netdev; | |
1221 | ||
1222 | if (likely(netif_carrier_ok(dev) && | |
1223 | RING_HAS_UNCONSUMED_RESPONSES(&np->rx))) | |
cf66f9d4 | 1224 | napi_schedule(&np->napi); |
cf66f9d4 | 1225 | |
d634bf2c WL |
1226 | return IRQ_HANDLED; |
1227 | } | |
cf66f9d4 | 1228 | |
d634bf2c WL |
1229 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) |
1230 | { | |
1231 | xennet_tx_interrupt(irq, dev_id); | |
1232 | xennet_rx_interrupt(irq, dev_id); | |
cf66f9d4 KRW |
1233 | return IRQ_HANDLED; |
1234 | } | |
1235 | ||
1236 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
1237 | static void xennet_poll_controller(struct net_device *dev) | |
1238 | { | |
1239 | xennet_interrupt(0, dev); | |
1240 | } | |
1241 | #endif | |
1242 | ||
0a0b9d2e SH |
1243 | static const struct net_device_ops xennet_netdev_ops = { |
1244 | .ndo_open = xennet_open, | |
1245 | .ndo_uninit = xennet_uninit, | |
1246 | .ndo_stop = xennet_close, | |
1247 | .ndo_start_xmit = xennet_start_xmit, | |
1248 | .ndo_change_mtu = xennet_change_mtu, | |
e00f85be | 1249 | .ndo_get_stats64 = xennet_get_stats64, |
0a0b9d2e SH |
1250 | .ndo_set_mac_address = eth_mac_addr, |
1251 | .ndo_validate_addr = eth_validate_addr, | |
fb507934 MM |
1252 | .ndo_fix_features = xennet_fix_features, |
1253 | .ndo_set_features = xennet_set_features, | |
cf66f9d4 KRW |
1254 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1255 | .ndo_poll_controller = xennet_poll_controller, | |
1256 | #endif | |
0a0b9d2e SH |
1257 | }; |
1258 | ||
8e0e46bb | 1259 | static struct net_device *xennet_create_dev(struct xenbus_device *dev) |
0d160211 JF |
1260 | { |
1261 | int i, err; | |
1262 | struct net_device *netdev; | |
1263 | struct netfront_info *np; | |
1264 | ||
1265 | netdev = alloc_etherdev(sizeof(struct netfront_info)); | |
41de8d4c | 1266 | if (!netdev) |
0d160211 | 1267 | return ERR_PTR(-ENOMEM); |
0d160211 JF |
1268 | |
1269 | np = netdev_priv(netdev); | |
1270 | np->xbdev = dev; | |
1271 | ||
1272 | spin_lock_init(&np->tx_lock); | |
1273 | spin_lock_init(&np->rx_lock); | |
1274 | ||
1275 | skb_queue_head_init(&np->rx_batch); | |
1276 | np->rx_target = RX_DFL_MIN_TARGET; | |
1277 | np->rx_min_target = RX_DFL_MIN_TARGET; | |
1278 | np->rx_max_target = RX_MAX_TARGET; | |
1279 | ||
1280 | init_timer(&np->rx_refill_timer); | |
1281 | np->rx_refill_timer.data = (unsigned long)netdev; | |
1282 | np->rx_refill_timer.function = rx_refill_timeout; | |
1283 | ||
e00f85be | 1284 | err = -ENOMEM; |
1c213bd2 | 1285 | np->stats = netdev_alloc_pcpu_stats(struct netfront_stats); |
e00f85be | 1286 | if (np->stats == NULL) |
1287 | goto exit; | |
1288 | ||
0d160211 JF |
1289 | /* Initialise tx_skbs as a free chain containing every entry. */ |
1290 | np->tx_skb_freelist = 0; | |
1291 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1ffb40b8 | 1292 | skb_entry_set_link(&np->tx_skbs[i], i+1); |
0d160211 JF |
1293 | np->grant_tx_ref[i] = GRANT_INVALID_REF; |
1294 | } | |
1295 | ||
1296 | /* Clear out rx_skbs */ | |
1297 | for (i = 0; i < NET_RX_RING_SIZE; i++) { | |
1298 | np->rx_skbs[i] = NULL; | |
1299 | np->grant_rx_ref[i] = GRANT_INVALID_REF; | |
cefe0078 | 1300 | np->grant_tx_page[i] = NULL; |
0d160211 JF |
1301 | } |
1302 | ||
1303 | /* A grant for every tx ring slot */ | |
1304 | if (gnttab_alloc_grant_references(TX_MAX_TARGET, | |
1305 | &np->gref_tx_head) < 0) { | |
383eda32 | 1306 | pr_alert("can't alloc tx grant refs\n"); |
0d160211 | 1307 | err = -ENOMEM; |
e00f85be | 1308 | goto exit_free_stats; |
0d160211 JF |
1309 | } |
1310 | /* A grant for every rx ring slot */ | |
1311 | if (gnttab_alloc_grant_references(RX_MAX_TARGET, | |
1312 | &np->gref_rx_head) < 0) { | |
383eda32 | 1313 | pr_alert("can't alloc rx grant refs\n"); |
0d160211 JF |
1314 | err = -ENOMEM; |
1315 | goto exit_free_tx; | |
1316 | } | |
1317 | ||
0a0b9d2e SH |
1318 | netdev->netdev_ops = &xennet_netdev_ops; |
1319 | ||
bea3348e | 1320 | netif_napi_add(netdev, &np->napi, xennet_poll, 64); |
fb507934 MM |
1321 | netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | |
1322 | NETIF_F_GSO_ROBUST; | |
2c0057de PD |
1323 | netdev->hw_features = NETIF_F_SG | |
1324 | NETIF_F_IPV6_CSUM | | |
1325 | NETIF_F_TSO | NETIF_F_TSO6; | |
0d160211 | 1326 | |
fc3e5941 IC |
1327 | /* |
1328 | * Assume that all hw features are available for now. This set | |
1329 | * will be adjusted by the call to netdev_update_features() in | |
1330 | * xennet_connect() which is the earliest point where we can | |
1331 | * negotiate with the backend regarding supported features. | |
1332 | */ | |
1333 | netdev->features |= netdev->hw_features; | |
1334 | ||
0d160211 | 1335 | SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops); |
0d160211 JF |
1336 | SET_NETDEV_DEV(netdev, &dev->dev); |
1337 | ||
9ecd1a75 WL |
1338 | netif_set_gso_max_size(netdev, XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER); |
1339 | ||
0d160211 JF |
1340 | np->netdev = netdev; |
1341 | ||
1342 | netif_carrier_off(netdev); | |
1343 | ||
1344 | return netdev; | |
1345 | ||
1346 | exit_free_tx: | |
1347 | gnttab_free_grant_references(np->gref_tx_head); | |
e00f85be | 1348 | exit_free_stats: |
1349 | free_percpu(np->stats); | |
0d160211 JF |
1350 | exit: |
1351 | free_netdev(netdev); | |
1352 | return ERR_PTR(err); | |
1353 | } | |
1354 | ||
1355 | /** | |
1356 | * Entry point to this code when a new device is created. Allocate the basic | |
1357 | * structures and the ring buffers for communication with the backend, and | |
1358 | * inform the backend of the appropriate details for those. | |
1359 | */ | |
8e0e46bb | 1360 | static int netfront_probe(struct xenbus_device *dev, |
1dd06ae8 | 1361 | const struct xenbus_device_id *id) |
0d160211 JF |
1362 | { |
1363 | int err; | |
1364 | struct net_device *netdev; | |
1365 | struct netfront_info *info; | |
1366 | ||
1367 | netdev = xennet_create_dev(dev); | |
1368 | if (IS_ERR(netdev)) { | |
1369 | err = PTR_ERR(netdev); | |
1370 | xenbus_dev_fatal(dev, err, "creating netdev"); | |
1371 | return err; | |
1372 | } | |
1373 | ||
1374 | info = netdev_priv(netdev); | |
1b713e00 | 1375 | dev_set_drvdata(&dev->dev, info); |
0d160211 JF |
1376 | |
1377 | err = register_netdev(info->netdev); | |
1378 | if (err) { | |
383eda32 | 1379 | pr_warn("%s: register_netdev err=%d\n", __func__, err); |
0d160211 JF |
1380 | goto fail; |
1381 | } | |
1382 | ||
1383 | err = xennet_sysfs_addif(info->netdev); | |
1384 | if (err) { | |
1385 | unregister_netdev(info->netdev); | |
383eda32 | 1386 | pr_warn("%s: add sysfs failed err=%d\n", __func__, err); |
0d160211 JF |
1387 | goto fail; |
1388 | } | |
1389 | ||
1390 | return 0; | |
1391 | ||
1392 | fail: | |
1393 | free_netdev(netdev); | |
1b713e00 | 1394 | dev_set_drvdata(&dev->dev, NULL); |
0d160211 JF |
1395 | return err; |
1396 | } | |
1397 | ||
1398 | static void xennet_end_access(int ref, void *page) | |
1399 | { | |
1400 | /* This frees the page as a side-effect */ | |
1401 | if (ref != GRANT_INVALID_REF) | |
1402 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); | |
1403 | } | |
1404 | ||
1405 | static void xennet_disconnect_backend(struct netfront_info *info) | |
1406 | { | |
1407 | /* Stop old i/f to prevent errors whilst we rebuild the state. */ | |
1408 | spin_lock_bh(&info->rx_lock); | |
1409 | spin_lock_irq(&info->tx_lock); | |
1410 | netif_carrier_off(info->netdev); | |
1411 | spin_unlock_irq(&info->tx_lock); | |
1412 | spin_unlock_bh(&info->rx_lock); | |
1413 | ||
d634bf2c WL |
1414 | if (info->tx_irq && (info->tx_irq == info->rx_irq)) |
1415 | unbind_from_irqhandler(info->tx_irq, info); | |
1416 | if (info->tx_irq && (info->tx_irq != info->rx_irq)) { | |
1417 | unbind_from_irqhandler(info->tx_irq, info); | |
1418 | unbind_from_irqhandler(info->rx_irq, info); | |
1419 | } | |
1420 | info->tx_evtchn = info->rx_evtchn = 0; | |
1421 | info->tx_irq = info->rx_irq = 0; | |
0d160211 JF |
1422 | |
1423 | /* End access and free the pages */ | |
1424 | xennet_end_access(info->tx_ring_ref, info->tx.sring); | |
1425 | xennet_end_access(info->rx_ring_ref, info->rx.sring); | |
1426 | ||
1427 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1428 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1429 | info->tx.sring = NULL; | |
1430 | info->rx.sring = NULL; | |
1431 | } | |
1432 | ||
1433 | /** | |
1434 | * We are reconnecting to the backend, due to a suspend/resume, or a backend | |
1435 | * driver restart. We tear down our netif structure and recreate it, but | |
1436 | * leave the device-layer structures intact so that this is transparent to the | |
1437 | * rest of the kernel. | |
1438 | */ | |
1439 | static int netfront_resume(struct xenbus_device *dev) | |
1440 | { | |
1b713e00 | 1441 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1442 | |
1443 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1444 | ||
1445 | xennet_disconnect_backend(info); | |
1446 | return 0; | |
1447 | } | |
1448 | ||
1449 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
1450 | { | |
1451 | char *s, *e, *macstr; | |
1452 | int i; | |
1453 | ||
1454 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
1455 | if (IS_ERR(macstr)) | |
1456 | return PTR_ERR(macstr); | |
1457 | ||
1458 | for (i = 0; i < ETH_ALEN; i++) { | |
1459 | mac[i] = simple_strtoul(s, &e, 16); | |
1460 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
1461 | kfree(macstr); | |
1462 | return -ENOENT; | |
1463 | } | |
1464 | s = e+1; | |
1465 | } | |
1466 | ||
1467 | kfree(macstr); | |
1468 | return 0; | |
1469 | } | |
1470 | ||
d634bf2c WL |
1471 | static int setup_netfront_single(struct netfront_info *info) |
1472 | { | |
1473 | int err; | |
1474 | ||
1475 | err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn); | |
1476 | if (err < 0) | |
1477 | goto fail; | |
1478 | ||
1479 | err = bind_evtchn_to_irqhandler(info->tx_evtchn, | |
1480 | xennet_interrupt, | |
1481 | 0, info->netdev->name, info); | |
1482 | if (err < 0) | |
1483 | goto bind_fail; | |
1484 | info->rx_evtchn = info->tx_evtchn; | |
1485 | info->rx_irq = info->tx_irq = err; | |
1486 | ||
1487 | return 0; | |
1488 | ||
1489 | bind_fail: | |
1490 | xenbus_free_evtchn(info->xbdev, info->tx_evtchn); | |
1491 | info->tx_evtchn = 0; | |
1492 | fail: | |
1493 | return err; | |
1494 | } | |
1495 | ||
1496 | static int setup_netfront_split(struct netfront_info *info) | |
1497 | { | |
1498 | int err; | |
1499 | ||
1500 | err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn); | |
1501 | if (err < 0) | |
1502 | goto fail; | |
1503 | err = xenbus_alloc_evtchn(info->xbdev, &info->rx_evtchn); | |
1504 | if (err < 0) | |
1505 | goto alloc_rx_evtchn_fail; | |
1506 | ||
1507 | snprintf(info->tx_irq_name, sizeof(info->tx_irq_name), | |
1508 | "%s-tx", info->netdev->name); | |
1509 | err = bind_evtchn_to_irqhandler(info->tx_evtchn, | |
1510 | xennet_tx_interrupt, | |
1511 | 0, info->tx_irq_name, info); | |
1512 | if (err < 0) | |
1513 | goto bind_tx_fail; | |
1514 | info->tx_irq = err; | |
1515 | ||
1516 | snprintf(info->rx_irq_name, sizeof(info->rx_irq_name), | |
1517 | "%s-rx", info->netdev->name); | |
1518 | err = bind_evtchn_to_irqhandler(info->rx_evtchn, | |
1519 | xennet_rx_interrupt, | |
1520 | 0, info->rx_irq_name, info); | |
1521 | if (err < 0) | |
1522 | goto bind_rx_fail; | |
1523 | info->rx_irq = err; | |
1524 | ||
1525 | return 0; | |
1526 | ||
1527 | bind_rx_fail: | |
1528 | unbind_from_irqhandler(info->tx_irq, info); | |
1529 | info->tx_irq = 0; | |
1530 | bind_tx_fail: | |
1531 | xenbus_free_evtchn(info->xbdev, info->rx_evtchn); | |
1532 | info->rx_evtchn = 0; | |
1533 | alloc_rx_evtchn_fail: | |
1534 | xenbus_free_evtchn(info->xbdev, info->tx_evtchn); | |
1535 | info->tx_evtchn = 0; | |
1536 | fail: | |
1537 | return err; | |
1538 | } | |
1539 | ||
0d160211 JF |
1540 | static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info) |
1541 | { | |
1542 | struct xen_netif_tx_sring *txs; | |
1543 | struct xen_netif_rx_sring *rxs; | |
1544 | int err; | |
1545 | struct net_device *netdev = info->netdev; | |
d634bf2c | 1546 | unsigned int feature_split_evtchn; |
0d160211 JF |
1547 | |
1548 | info->tx_ring_ref = GRANT_INVALID_REF; | |
1549 | info->rx_ring_ref = GRANT_INVALID_REF; | |
1550 | info->rx.sring = NULL; | |
1551 | info->tx.sring = NULL; | |
1552 | netdev->irq = 0; | |
1553 | ||
d634bf2c WL |
1554 | err = xenbus_scanf(XBT_NIL, info->xbdev->otherend, |
1555 | "feature-split-event-channels", "%u", | |
1556 | &feature_split_evtchn); | |
1557 | if (err < 0) | |
1558 | feature_split_evtchn = 0; | |
1559 | ||
0d160211 JF |
1560 | err = xen_net_read_mac(dev, netdev->dev_addr); |
1561 | if (err) { | |
1562 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
1563 | goto fail; | |
1564 | } | |
1565 | ||
a144ff09 | 1566 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1567 | if (!txs) { |
1568 | err = -ENOMEM; | |
1569 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); | |
1570 | goto fail; | |
1571 | } | |
1572 | SHARED_RING_INIT(txs); | |
1573 | FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); | |
1574 | ||
1575 | err = xenbus_grant_ring(dev, virt_to_mfn(txs)); | |
1ca2983a WL |
1576 | if (err < 0) |
1577 | goto grant_tx_ring_fail; | |
0d160211 JF |
1578 | |
1579 | info->tx_ring_ref = err; | |
a144ff09 | 1580 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1581 | if (!rxs) { |
1582 | err = -ENOMEM; | |
1583 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); | |
1ca2983a | 1584 | goto alloc_rx_ring_fail; |
0d160211 JF |
1585 | } |
1586 | SHARED_RING_INIT(rxs); | |
1587 | FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); | |
1588 | ||
1589 | err = xenbus_grant_ring(dev, virt_to_mfn(rxs)); | |
1ca2983a WL |
1590 | if (err < 0) |
1591 | goto grant_rx_ring_fail; | |
0d160211 JF |
1592 | info->rx_ring_ref = err; |
1593 | ||
d634bf2c WL |
1594 | if (feature_split_evtchn) |
1595 | err = setup_netfront_split(info); | |
1596 | /* setup single event channel if | |
1597 | * a) feature-split-event-channels == 0 | |
1598 | * b) feature-split-event-channels == 1 but failed to setup | |
1599 | */ | |
1600 | if (!feature_split_evtchn || (feature_split_evtchn && err)) | |
1601 | err = setup_netfront_single(info); | |
1602 | ||
0d160211 | 1603 | if (err) |
1ca2983a | 1604 | goto alloc_evtchn_fail; |
0d160211 | 1605 | |
0d160211 JF |
1606 | return 0; |
1607 | ||
1ca2983a WL |
1608 | /* If we fail to setup netfront, it is safe to just revoke access to |
1609 | * granted pages because backend is not accessing it at this point. | |
1610 | */ | |
1ca2983a WL |
1611 | alloc_evtchn_fail: |
1612 | gnttab_end_foreign_access_ref(info->rx_ring_ref, 0); | |
1613 | grant_rx_ring_fail: | |
1614 | free_page((unsigned long)rxs); | |
1615 | alloc_rx_ring_fail: | |
1616 | gnttab_end_foreign_access_ref(info->tx_ring_ref, 0); | |
1617 | grant_tx_ring_fail: | |
1618 | free_page((unsigned long)txs); | |
1619 | fail: | |
0d160211 JF |
1620 | return err; |
1621 | } | |
1622 | ||
1623 | /* Common code used when first setting up, and when resuming. */ | |
f502bf2b | 1624 | static int talk_to_netback(struct xenbus_device *dev, |
0d160211 JF |
1625 | struct netfront_info *info) |
1626 | { | |
1627 | const char *message; | |
1628 | struct xenbus_transaction xbt; | |
1629 | int err; | |
1630 | ||
1631 | /* Create shared ring, alloc event channel. */ | |
1632 | err = setup_netfront(dev, info); | |
1633 | if (err) | |
1634 | goto out; | |
1635 | ||
1636 | again: | |
1637 | err = xenbus_transaction_start(&xbt); | |
1638 | if (err) { | |
1639 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
1640 | goto destroy_ring; | |
1641 | } | |
1642 | ||
1643 | err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u", | |
1644 | info->tx_ring_ref); | |
1645 | if (err) { | |
1646 | message = "writing tx ring-ref"; | |
1647 | goto abort_transaction; | |
1648 | } | |
1649 | err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u", | |
1650 | info->rx_ring_ref); | |
1651 | if (err) { | |
1652 | message = "writing rx ring-ref"; | |
1653 | goto abort_transaction; | |
1654 | } | |
d634bf2c WL |
1655 | |
1656 | if (info->tx_evtchn == info->rx_evtchn) { | |
1657 | err = xenbus_printf(xbt, dev->nodename, | |
1658 | "event-channel", "%u", info->tx_evtchn); | |
1659 | if (err) { | |
1660 | message = "writing event-channel"; | |
1661 | goto abort_transaction; | |
1662 | } | |
1663 | } else { | |
1664 | err = xenbus_printf(xbt, dev->nodename, | |
1665 | "event-channel-tx", "%u", info->tx_evtchn); | |
1666 | if (err) { | |
1667 | message = "writing event-channel-tx"; | |
1668 | goto abort_transaction; | |
1669 | } | |
1670 | err = xenbus_printf(xbt, dev->nodename, | |
1671 | "event-channel-rx", "%u", info->rx_evtchn); | |
1672 | if (err) { | |
1673 | message = "writing event-channel-rx"; | |
1674 | goto abort_transaction; | |
1675 | } | |
0d160211 JF |
1676 | } |
1677 | ||
1678 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", | |
1679 | 1); | |
1680 | if (err) { | |
1681 | message = "writing request-rx-copy"; | |
1682 | goto abort_transaction; | |
1683 | } | |
1684 | ||
1685 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); | |
1686 | if (err) { | |
1687 | message = "writing feature-rx-notify"; | |
1688 | goto abort_transaction; | |
1689 | } | |
1690 | ||
1691 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); | |
1692 | if (err) { | |
1693 | message = "writing feature-sg"; | |
1694 | goto abort_transaction; | |
1695 | } | |
1696 | ||
1697 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); | |
1698 | if (err) { | |
1699 | message = "writing feature-gso-tcpv4"; | |
1700 | goto abort_transaction; | |
1701 | } | |
1702 | ||
2c0057de PD |
1703 | err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1"); |
1704 | if (err) { | |
1705 | message = "writing feature-gso-tcpv6"; | |
1706 | goto abort_transaction; | |
1707 | } | |
1708 | ||
1709 | err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload", | |
1710 | "1"); | |
1711 | if (err) { | |
1712 | message = "writing feature-ipv6-csum-offload"; | |
1713 | goto abort_transaction; | |
1714 | } | |
1715 | ||
0d160211 JF |
1716 | err = xenbus_transaction_end(xbt, 0); |
1717 | if (err) { | |
1718 | if (err == -EAGAIN) | |
1719 | goto again; | |
1720 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
1721 | goto destroy_ring; | |
1722 | } | |
1723 | ||
1724 | return 0; | |
1725 | ||
1726 | abort_transaction: | |
1727 | xenbus_transaction_end(xbt, 1); | |
1728 | xenbus_dev_fatal(dev, err, "%s", message); | |
1729 | destroy_ring: | |
1730 | xennet_disconnect_backend(info); | |
1731 | out: | |
1732 | return err; | |
1733 | } | |
1734 | ||
0d160211 JF |
1735 | static int xennet_connect(struct net_device *dev) |
1736 | { | |
1737 | struct netfront_info *np = netdev_priv(dev); | |
1738 | int i, requeue_idx, err; | |
1739 | struct sk_buff *skb; | |
1740 | grant_ref_t ref; | |
1741 | struct xen_netif_rx_request *req; | |
1742 | unsigned int feature_rx_copy; | |
1743 | ||
1744 | err = xenbus_scanf(XBT_NIL, np->xbdev->otherend, | |
1745 | "feature-rx-copy", "%u", &feature_rx_copy); | |
1746 | if (err != 1) | |
1747 | feature_rx_copy = 0; | |
1748 | ||
1749 | if (!feature_rx_copy) { | |
1750 | dev_info(&dev->dev, | |
898eb71c | 1751 | "backend does not support copying receive path\n"); |
0d160211 JF |
1752 | return -ENODEV; |
1753 | } | |
1754 | ||
f502bf2b | 1755 | err = talk_to_netback(np->xbdev, np); |
0d160211 JF |
1756 | if (err) |
1757 | return err; | |
1758 | ||
1ba37c51 | 1759 | rtnl_lock(); |
fb507934 | 1760 | netdev_update_features(dev); |
1ba37c51 | 1761 | rtnl_unlock(); |
0d160211 JF |
1762 | |
1763 | spin_lock_bh(&np->rx_lock); | |
1764 | spin_lock_irq(&np->tx_lock); | |
1765 | ||
1766 | /* Step 1: Discard all pending TX packet fragments. */ | |
1767 | xennet_release_tx_bufs(np); | |
1768 | ||
1769 | /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ | |
1770 | for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { | |
01c68026 IC |
1771 | skb_frag_t *frag; |
1772 | const struct page *page; | |
0d160211 JF |
1773 | if (!np->rx_skbs[i]) |
1774 | continue; | |
1775 | ||
1776 | skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i); | |
1777 | ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); | |
1778 | req = RING_GET_REQUEST(&np->rx, requeue_idx); | |
1779 | ||
01c68026 IC |
1780 | frag = &skb_shinfo(skb)->frags[0]; |
1781 | page = skb_frag_page(frag); | |
0d160211 JF |
1782 | gnttab_grant_foreign_access_ref( |
1783 | ref, np->xbdev->otherend_id, | |
01c68026 | 1784 | pfn_to_mfn(page_to_pfn(page)), |
0d160211 JF |
1785 | 0); |
1786 | req->gref = ref; | |
1787 | req->id = requeue_idx; | |
1788 | ||
1789 | requeue_idx++; | |
1790 | } | |
1791 | ||
1792 | np->rx.req_prod_pvt = requeue_idx; | |
1793 | ||
1794 | /* | |
1795 | * Step 3: All public and private state should now be sane. Get | |
1796 | * ready to start sending and receiving packets and give the driver | |
1797 | * domain a kick because we've probably just requeued some | |
1798 | * packets. | |
1799 | */ | |
1800 | netif_carrier_on(np->netdev); | |
d634bf2c WL |
1801 | notify_remote_via_irq(np->tx_irq); |
1802 | if (np->tx_irq != np->rx_irq) | |
1803 | notify_remote_via_irq(np->rx_irq); | |
0d160211 JF |
1804 | xennet_tx_buf_gc(dev); |
1805 | xennet_alloc_rx_buffers(dev); | |
1806 | ||
1807 | spin_unlock_irq(&np->tx_lock); | |
1808 | spin_unlock_bh(&np->rx_lock); | |
1809 | ||
1810 | return 0; | |
1811 | } | |
1812 | ||
1813 | /** | |
1814 | * Callback received when the backend's state changes. | |
1815 | */ | |
f502bf2b | 1816 | static void netback_changed(struct xenbus_device *dev, |
0d160211 JF |
1817 | enum xenbus_state backend_state) |
1818 | { | |
1b713e00 | 1819 | struct netfront_info *np = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1820 | struct net_device *netdev = np->netdev; |
1821 | ||
1822 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); | |
1823 | ||
1824 | switch (backend_state) { | |
1825 | case XenbusStateInitialising: | |
1826 | case XenbusStateInitialised: | |
b78c9512 NI |
1827 | case XenbusStateReconfiguring: |
1828 | case XenbusStateReconfigured: | |
0d160211 | 1829 | case XenbusStateUnknown: |
0d160211 JF |
1830 | break; |
1831 | ||
1832 | case XenbusStateInitWait: | |
1833 | if (dev->state != XenbusStateInitialising) | |
1834 | break; | |
1835 | if (xennet_connect(netdev) != 0) | |
1836 | break; | |
1837 | xenbus_switch_state(dev, XenbusStateConnected); | |
08e34eb1 LE |
1838 | break; |
1839 | ||
1840 | case XenbusStateConnected: | |
ee89bab1 | 1841 | netdev_notify_peers(netdev); |
0d160211 JF |
1842 | break; |
1843 | ||
bce3ea81 DV |
1844 | case XenbusStateClosed: |
1845 | if (dev->state == XenbusStateClosed) | |
1846 | break; | |
1847 | /* Missed the backend's CLOSING state -- fallthrough */ | |
0d160211 JF |
1848 | case XenbusStateClosing: |
1849 | xenbus_frontend_closed(dev); | |
1850 | break; | |
1851 | } | |
1852 | } | |
1853 | ||
e0ce4af9 IC |
1854 | static const struct xennet_stat { |
1855 | char name[ETH_GSTRING_LEN]; | |
1856 | u16 offset; | |
1857 | } xennet_stats[] = { | |
1858 | { | |
1859 | "rx_gso_checksum_fixup", | |
1860 | offsetof(struct netfront_info, rx_gso_checksum_fixup) | |
1861 | }, | |
1862 | }; | |
1863 | ||
1864 | static int xennet_get_sset_count(struct net_device *dev, int string_set) | |
1865 | { | |
1866 | switch (string_set) { | |
1867 | case ETH_SS_STATS: | |
1868 | return ARRAY_SIZE(xennet_stats); | |
1869 | default: | |
1870 | return -EINVAL; | |
1871 | } | |
1872 | } | |
1873 | ||
1874 | static void xennet_get_ethtool_stats(struct net_device *dev, | |
1875 | struct ethtool_stats *stats, u64 * data) | |
1876 | { | |
1877 | void *np = netdev_priv(dev); | |
1878 | int i; | |
1879 | ||
1880 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
48f26d51 | 1881 | data[i] = *(unsigned long *)(np + xennet_stats[i].offset); |
e0ce4af9 IC |
1882 | } |
1883 | ||
1884 | static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) | |
1885 | { | |
1886 | int i; | |
1887 | ||
1888 | switch (stringset) { | |
1889 | case ETH_SS_STATS: | |
1890 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
1891 | memcpy(data + i * ETH_GSTRING_LEN, | |
1892 | xennet_stats[i].name, ETH_GSTRING_LEN); | |
1893 | break; | |
1894 | } | |
1895 | } | |
1896 | ||
0fc0b732 | 1897 | static const struct ethtool_ops xennet_ethtool_ops = |
0d160211 | 1898 | { |
0d160211 | 1899 | .get_link = ethtool_op_get_link, |
e0ce4af9 IC |
1900 | |
1901 | .get_sset_count = xennet_get_sset_count, | |
1902 | .get_ethtool_stats = xennet_get_ethtool_stats, | |
1903 | .get_strings = xennet_get_strings, | |
0d160211 JF |
1904 | }; |
1905 | ||
1906 | #ifdef CONFIG_SYSFS | |
1907 | static ssize_t show_rxbuf_min(struct device *dev, | |
1908 | struct device_attribute *attr, char *buf) | |
1909 | { | |
1910 | struct net_device *netdev = to_net_dev(dev); | |
1911 | struct netfront_info *info = netdev_priv(netdev); | |
1912 | ||
1913 | return sprintf(buf, "%u\n", info->rx_min_target); | |
1914 | } | |
1915 | ||
1916 | static ssize_t store_rxbuf_min(struct device *dev, | |
1917 | struct device_attribute *attr, | |
1918 | const char *buf, size_t len) | |
1919 | { | |
1920 | struct net_device *netdev = to_net_dev(dev); | |
1921 | struct netfront_info *np = netdev_priv(netdev); | |
1922 | char *endp; | |
1923 | unsigned long target; | |
1924 | ||
1925 | if (!capable(CAP_NET_ADMIN)) | |
1926 | return -EPERM; | |
1927 | ||
1928 | target = simple_strtoul(buf, &endp, 0); | |
1929 | if (endp == buf) | |
1930 | return -EBADMSG; | |
1931 | ||
1932 | if (target < RX_MIN_TARGET) | |
1933 | target = RX_MIN_TARGET; | |
1934 | if (target > RX_MAX_TARGET) | |
1935 | target = RX_MAX_TARGET; | |
1936 | ||
1937 | spin_lock_bh(&np->rx_lock); | |
1938 | if (target > np->rx_max_target) | |
1939 | np->rx_max_target = target; | |
1940 | np->rx_min_target = target; | |
1941 | if (target > np->rx_target) | |
1942 | np->rx_target = target; | |
1943 | ||
1944 | xennet_alloc_rx_buffers(netdev); | |
1945 | ||
1946 | spin_unlock_bh(&np->rx_lock); | |
1947 | return len; | |
1948 | } | |
1949 | ||
1950 | static ssize_t show_rxbuf_max(struct device *dev, | |
1951 | struct device_attribute *attr, char *buf) | |
1952 | { | |
1953 | struct net_device *netdev = to_net_dev(dev); | |
1954 | struct netfront_info *info = netdev_priv(netdev); | |
1955 | ||
1956 | return sprintf(buf, "%u\n", info->rx_max_target); | |
1957 | } | |
1958 | ||
1959 | static ssize_t store_rxbuf_max(struct device *dev, | |
1960 | struct device_attribute *attr, | |
1961 | const char *buf, size_t len) | |
1962 | { | |
1963 | struct net_device *netdev = to_net_dev(dev); | |
1964 | struct netfront_info *np = netdev_priv(netdev); | |
1965 | char *endp; | |
1966 | unsigned long target; | |
1967 | ||
1968 | if (!capable(CAP_NET_ADMIN)) | |
1969 | return -EPERM; | |
1970 | ||
1971 | target = simple_strtoul(buf, &endp, 0); | |
1972 | if (endp == buf) | |
1973 | return -EBADMSG; | |
1974 | ||
1975 | if (target < RX_MIN_TARGET) | |
1976 | target = RX_MIN_TARGET; | |
1977 | if (target > RX_MAX_TARGET) | |
1978 | target = RX_MAX_TARGET; | |
1979 | ||
1980 | spin_lock_bh(&np->rx_lock); | |
1981 | if (target < np->rx_min_target) | |
1982 | np->rx_min_target = target; | |
1983 | np->rx_max_target = target; | |
1984 | if (target < np->rx_target) | |
1985 | np->rx_target = target; | |
1986 | ||
1987 | xennet_alloc_rx_buffers(netdev); | |
1988 | ||
1989 | spin_unlock_bh(&np->rx_lock); | |
1990 | return len; | |
1991 | } | |
1992 | ||
1993 | static ssize_t show_rxbuf_cur(struct device *dev, | |
1994 | struct device_attribute *attr, char *buf) | |
1995 | { | |
1996 | struct net_device *netdev = to_net_dev(dev); | |
1997 | struct netfront_info *info = netdev_priv(netdev); | |
1998 | ||
1999 | return sprintf(buf, "%u\n", info->rx_target); | |
2000 | } | |
2001 | ||
2002 | static struct device_attribute xennet_attrs[] = { | |
2003 | __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min), | |
2004 | __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max), | |
2005 | __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL), | |
2006 | }; | |
2007 | ||
2008 | static int xennet_sysfs_addif(struct net_device *netdev) | |
2009 | { | |
2010 | int i; | |
2011 | int err; | |
2012 | ||
2013 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) { | |
2014 | err = device_create_file(&netdev->dev, | |
2015 | &xennet_attrs[i]); | |
2016 | if (err) | |
2017 | goto fail; | |
2018 | } | |
2019 | return 0; | |
2020 | ||
2021 | fail: | |
2022 | while (--i >= 0) | |
2023 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
2024 | return err; | |
2025 | } | |
2026 | ||
2027 | static void xennet_sysfs_delif(struct net_device *netdev) | |
2028 | { | |
2029 | int i; | |
2030 | ||
2031 | for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) | |
2032 | device_remove_file(&netdev->dev, &xennet_attrs[i]); | |
2033 | } | |
2034 | ||
2035 | #endif /* CONFIG_SYSFS */ | |
2036 | ||
73db144b | 2037 | static const struct xenbus_device_id netfront_ids[] = { |
0d160211 JF |
2038 | { "vif" }, |
2039 | { "" } | |
2040 | }; | |
2041 | ||
2042 | ||
8e0e46bb | 2043 | static int xennet_remove(struct xenbus_device *dev) |
0d160211 | 2044 | { |
1b713e00 | 2045 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
2046 | |
2047 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
2048 | ||
0d160211 JF |
2049 | xennet_disconnect_backend(info); |
2050 | ||
0d160211 JF |
2051 | xennet_sysfs_delif(info->netdev); |
2052 | ||
6bc96d04 IC |
2053 | unregister_netdev(info->netdev); |
2054 | ||
2055 | del_timer_sync(&info->rx_refill_timer); | |
2056 | ||
e00f85be | 2057 | free_percpu(info->stats); |
2058 | ||
0d160211 JF |
2059 | free_netdev(info->netdev); |
2060 | ||
2061 | return 0; | |
2062 | } | |
2063 | ||
73db144b | 2064 | static DEFINE_XENBUS_DRIVER(netfront, , |
0d160211 | 2065 | .probe = netfront_probe, |
8e0e46bb | 2066 | .remove = xennet_remove, |
0d160211 | 2067 | .resume = netfront_resume, |
f502bf2b | 2068 | .otherend_changed = netback_changed, |
73db144b | 2069 | ); |
0d160211 JF |
2070 | |
2071 | static int __init netif_init(void) | |
2072 | { | |
6e833587 | 2073 | if (!xen_domain()) |
0d160211 JF |
2074 | return -ENODEV; |
2075 | ||
51c71a3b | 2076 | if (!xen_has_pv_nic_devices()) |
b9136d20 IM |
2077 | return -ENODEV; |
2078 | ||
383eda32 | 2079 | pr_info("Initialising Xen virtual ethernet driver\n"); |
0d160211 | 2080 | |
ffb78a26 | 2081 | return xenbus_register_frontend(&netfront_driver); |
0d160211 JF |
2082 | } |
2083 | module_init(netif_init); | |
2084 | ||
2085 | ||
2086 | static void __exit netif_exit(void) | |
2087 | { | |
ffb78a26 | 2088 | xenbus_unregister_driver(&netfront_driver); |
0d160211 JF |
2089 | } |
2090 | module_exit(netif_exit); | |
2091 | ||
2092 | MODULE_DESCRIPTION("Xen virtual network device frontend"); | |
2093 | MODULE_LICENSE("GPL"); | |
d2f0c52b | 2094 | MODULE_ALIAS("xen:vif"); |
4f93f09b | 2095 | MODULE_ALIAS("xennet"); |